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Segment Information - Reconciliation of Segment Operating Revenues Consolidated (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Operating Revenue And Profit (Loss) From Segments To Consolidated |  |  |
Total revenues | $ 16,127.7 | $ 13,665.8 | $ 17,536.1
Operating Segments |  |  |
Operating Revenue And Profit (Loss) From Segments To Consolidated |  |  |
Revenue from contracts with external customers | 11,165.7 | 10,565.8 | 9,476.4
Adjustments for revenue from contracts with external customers not included in operating revenues | (49.6) | (67.9) | (89.2)
Net investment income included in operating revenues | 4,281.2 | 3,946.0 | 3,811.0
Operating revenues from equity method investments | 235.0 | 216.3 | 202.2
Total revenues | 15,632.3 | 14,660.2 | 13,400.4
Operating Segments | Retirement and Income Solutions |  |  |
Operating Revenue And Profit (Loss) From Segments To Consolidated |  |  |
Revenue from contracts with external customers | 4,957.8 | 4,647.5 | 3,667.1
Adjustments for revenue from contracts with external customers not included in operating revenues | (74.7) | (80.6) | (89.2)
Net investment income included in operating revenues | 3,040.5 | 2,648.1 | 2,322.1
Total revenues | 7,976.1 | 7,250.2 | 5,899.2
Operating Segments | Principal Asset Management |  |  |
Operating Revenue And Profit (Loss) From Segments To Consolidated |  |  |
Revenue from contracts with external customers | 1,824.5 | 1,775.5 | 1,889.4
Net investment income included in operating revenues | 426.7 | 492.7 | 783.7
Operating revenues from equity method investments | 235.4 | 216.3 | 202.2
Total revenues | 2,790.4 | 2,782.3 | 3,181.3
Operating Segments | Benefits and Protection |  |  |
Operating Revenue And Profit (Loss) From Segments To Consolidated |  |  |
Revenue from contracts with external customers | 4,142.5 | 3,938.1 | 3,713.2
Adjustments for revenue from contracts with external customers not included in operating revenues | 25.1 | 12.7 |
Net investment income included in operating revenues | 613.6 | 584.4 | 592.2
Total revenues | 4,789.0 | 4,551.3 | 4,302.8
Operating Segments | Corporate |  |  |
Operating Revenue And Profit (Loss) From Segments To Consolidated |  |  |
Revenue from contracts with external customers | 240.9 | 204.7 | 206.7
Net investment income included in operating revenues | 200.4 | 220.8 | 113.0
Operating revenues from equity method investments | (0.4) |  |
Total revenues | 76.8 | 76.4 | 17.1
Inter-segment eliminations |  |  |
Operating Revenue And Profit (Loss) From Segments To Consolidated |  |  |
Inter-segment revenues | 649.6 | 551.7 | 516.8
Total revenues | (649.6) | (551.7) | (516.8)
Inter-segment eliminations | Retirement and Income Solutions |  |  |
Operating Revenue And Profit (Loss) From Segments To Consolidated |  |  |
Inter-segment revenues | 52.5 | 35.2 | (0.8)
Inter-segment eliminations | Principal Asset Management |  |  |
Operating Revenue And Profit (Loss) From Segments To Consolidated |  |  |
Inter-segment revenues | 303.8 | 297.8 | 306.0
Inter-segment eliminations | Benefits and Protection |  |  |
Operating Revenue And Profit (Loss) From Segments To Consolidated |  |  |
Inter-segment revenues | 7.8 | 16.1 | (2.6)
Inter-segment eliminations | Corporate |  |  |
Operating Revenue And Profit (Loss) From Segments To Consolidated |  |  |
Inter-segment revenues | 285.5 | 202.6 | 214.2
Total revenues | (649.6) | (551.7) | (516.8)
Reconciling items |  |  |
Operating Revenue And Profit (Loss) From Segments To Consolidated |  |  |
Net realized capital gains (losses), net of related revenue adjustments | 102.7 | 57.9 | (189.6)
Revenues from exited business | 513.3 | (927.5) | 4,414.8
Adjustments related to equity method investments | (74.8) | (78.9) | (54.5)
Market risk benefit derivative settlements | $ (45.8) | $ (45.9) | $ (35.0)

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